from tkinter import *
x=int(input("Введите координату x "))
y=int(input("Введите координату y "))
N=int(input("Введите N "))
coords = [0, 0, 10, 0, 10, 10, 20, 10, 20, 20, 10, 20, 10, 30, 0, 30, 0, 20, 0, 10]
if N == 0 and x>=0 and x<=500 and y>=0 and y<=500:
    pass
else:
    if N > 0 and 0*N+x>=0 and 0*N+y>=0 and 30*N+x<=500 and 30*N+y<=500:
        pass
    else:
        if N < 0 and 30*N+x>=0 and 30*N+y>=0 and 0*N+x<=500 and 0*N+y<=500:
            pass
        else:
            print("Размер фигуры превышает максимальный размер поля")
            exit()
root = Tk()
root.title("ИТ марафон")
root.geometry("500x500")
canvas = Canvas(bg="white", width=500, height=500)
canvas.pack(anchor=CENTER, expand=1)
canvas.create_polygon(coords [0]*N+x, coords [1]*N+y,
                      coords [2]*N+x, coords [3]*N+y,
                      coords [4]*N+x, coords [5]*N+y,
                      coords [6]*N+x, coords [7]*N+y,
                      coords [8]*N+x, coords [9]*N+y, 
                      coords [10]*N+x, coords [11]*N+y,
                      coords [12]*N+x, coords [13]*N+y,
                      coords [14]*N+x, coords [15]*N+y)
root.mainloop ()
